Dental molding apparatus.



J. BURNS.

DENTAL MOLDING APPARATUS.

APPLICATION FILED FEB- la. 1915.

1,146,550. Patented July 13, 1915.

l rr-" m m A a 2k WITNESSES l/VVE/VTDI? JOHN BURNS, 0F 1\TEW YORK, N. Y.

DENTAL MOLDING APPARATUS.

Specification of Letters Patent.

Patented July 13, 15315.

Application filed February 18, 1915. Serial. No. 9,065.

To all whom it may concern.

Be it known that LJOHN BURNS, a citizen of the United States, residing in the borough of Queens of the city of New York,

State of New York, have made certain new and useful Improvements in Dental Molding Apparatus; and I hereby declare the following specification to be a description thereof, reference being bad to the accompanying drawing; y

The object ofmiyinvention is to provide a convenient and efficient means for taking impressions in the production of the various kinds of dental work, such as what is known as crown work, or the reproduction of saddle formation, and plates.

In the drawings: Figure 1 is a top view of my device showing the flaskand compressor, made integral. Fig. 2 shows the compressor with the flask removed; Fig. 3 is a side view of Fig. 1; Fig. & is an interior view of one half of the flask; and Fig. 5 shows a modification of the device.

The principal part of the apparatus employed in my improvements comprises what may take the place of a flask in molding and is composed of two parts A and B. These parts are of the desired shape or size to suit the work being done.

C, represents generally a compressing de vice for manipulating the flask which for convenience, has two handles D, and D secured together by means of a pin E passing through them, and having on one end a nut a. A locking arm G, is secured to one arm D, of the compressing tongs, by a swivel pin 6, and is notched at the other end to engage a pin 0, located on the other arm D The ends H, H, of the compressing device are made fiat and provided with sockets or holes it, h, which will receive pins 2', 2', located on the base of the two halves or cups, A and B holding the molding composition. The holes are made to register with the pins and if desired retaining screw nuts n, a, may be employed to hold them in place. Or the cups may be integral with the tongs.

The shape and size of the two cups, or halves A and B will vary with the size of the pattern, or mold, of the work which is being used, but they should always conform to the requirements herein referred to; that is they should have two open sides, one of which faces the other half. When the two halves A and B are brought together ready to have the fusible metal poured, and are fastened by the catch 0, they may be re moved and other cups of different size such as an oblong shape, be placed in position.

In the present practice of producing dental work such as crowns for individual teeth, or more extended work, covering the saddlesof the gums or plates for the palate, the plaster cast or pattern is pressed down "into a cup, or other receptacle containing molding composition and the composition is pressed around the pattern. The pattern is thenlifted vertically out of the composition and the fusible metal poured directly into the cavity thus left in the molding composition contained in the cup. The cast so obtained is then filed or gone over, so as to have the proper shape and the gold covering then worked over it.

In my new method I discard the single receptacle for the molding composition and employ the two halves or cups A and B which I first fill with the molding composition pressing it into place and making the side or face of the composition in each of the halves where they will contact even and smooth. The exposed face of the composition is then dusted with a powder as indicated at t Fig. 4 suflicient to prevent the two portions of composition contained in the parts A and B adhering to each other when they come in contact. The model of the work in hand is then placed between the two halves A. and B of the flask, after which the handles D and D of the compressing tongs being worked together, the two cups or halves of the flask are closed upon the pattern and locked in position by means of the arm G. The molding composition is then pressed or packed down around the model or pattern by use of the fingers or otherwise at the exposed or open face of the flask. It will be understood that dur ing this operation of pressing down the molding composition the two halves of the flask A and B, are firmly held together by the locked handles of the tongs.

l have found that the least movement of the two molding cups will cause defective work and therefore the locking bar G plays an important part in the operations of the device, by making a firm container during the operation of pressing down the molding composition so the two cups A and B, are substantially as firm as though it was a single receptacle.

After the composition has been firmly flask closely against each other as in Fig. 1,

pressed around the mold or pattern thearm Gr is lifted and the two halves A and B of the flask will be drawn apart sothat a cleavage of the molding composition takes place along the center leaving a half of the impressionof the pattern in each of the parts A and B. The pattern havingbeen removed, the handles of the compress-- ing tongs are worked together again to bring the opposing faces of the two halves of the and the arm G used to lock them again. The

fusible metal is thenpoured into the-flask.

at the same time avail myself of the use of a molding composition whlch is pressed around the pattern after t is in place.

I have shown and described the means I prefer to use in bringing and holding together the two halves of the molding device,'but I do not wish to confine myself .to the exactmechanism shown as the two halves of the flask, may be brought together and fastened by other analogous means, so long as there is an open portion at which the molding composition may be compressed around the pattern after it is in position.

In Fig. 5 the two cups or halves of the flask are shown held together by catches o, 0,

and registering pins 79, 79, are employedon one cup with sockets 79 in the other cup.

I claim as my invention: In apparatus for making castlngs for dental work, moldingcups A and B having pins i, i, and 79, sockets p and catch 0 in combination with gaws H, H, pivotally connected and provided with registering holes it, it, -.and manipulating arms D, D substantially as and for the purposes shown and described.

JOHN BURNS.

Witnesses:

' WALTER E. ll ICDONNELL, MICHAEL J. MODONNELL.

copies of this patent may be obtained for five cents each by addressing the Commissioner of. Patents, Washington, D. G. 

